HI all, I am trying to find a fertility or ovulation calendar for my pocket pc

.. so far i found 2 (handango has one and so does pdatopsoft.com has the oher ) the problem is i dont want to pay so much for this program ... especially if i will only need it 1 or to months

so does anyone have something similar ... i need something that will track my temperature and put it into a graph to help predict my most fertile days ...
Thanks ..